Comtech EF Data CMR-6000 Manual - Manual (Page 53)

Digicast Media Router S2 Receiver CMR-6000 Revision 1
Device Management via User Interfaces MN-CMR6000-IOM
4-23
Downlink Frequency
The actual receive frequency being down linked from the satellite to the Low Noise Block (LNB)
amplifier located at the antenna. For Ku-Band operation, this frequency ranges from 10,700 MHz to
12,750 MHz. For C-Band operation, this frequency ranges from 3,400 MHz to 4,200 MHz.
The combination of the LO and the downlink frequency produce the L-Band frequency expected by the
CMR-6000. Some examples are as follows:
Example 1:
LO = 10,750 MHz
Ku-Band Receive Frequency = 11,895 MHz
L-Band Frequency = 11,895 MHz – 10,750 MHz
L-Band Frequency = 1,145 MHz
Example 2:
LO = 10,600 MHz
Ku-Band Receive Frequency = 12,010 MHz
L-Band Frequency = 12,010 MHz – 10,600 MHz
L-Band Frequency = 1,410 MHz
Example 3:
LO = 5,150 MHz
C-Band Receive Frequency = 3,920 MHz
L-Band Frequency = 5,150 MHz – 3,920 MHz
L-Band Frequency = 1,230 MHz
Example 4 (Direct L-Band entry):
This would be used if the user desired to not enter in the LO and RX frequencies. For this
example assume the same values as example 1:
LO = 10,750 MHz
Ku-Band Receive Frequency = 11,895 MHz
L-Band Frequency = 11,895 MHz – 10,750 MHz
The user would simply enter:
LO = 0 MHz (this allows the direct entry of the L-Band frequency)
L-Band Frequency = 1,170 MHz as the RX frequency
Modulation
The CMR-6000 supports the following modes of operation:
• DVB-S – QPSK
• DVB-S2 – QPSK
• DVB-S2 – 8PSK
Each mode of operation provides a range of FEC rates that are supported based on the mode and
modulation.
Symbol Rate
Depending on the configured mode of operation, the following symbol rates are supported:
DVB-S – QPSK 2 to 45 Msps
DVB-S2 – QPSK 2 to 32 Msps